Just update BIOS, you will be fine (download and save the latest BIOS in a USB memory, insert it, start the system, press F6 to enter ASRock Instant Flash utility).
H87 chipset is no good for a "K" chip nor DDR3-2400 SDRAM. Z87 is required to overclock K and support memory > 1600MHz.
Check also Samsung 840 EVO, the successor to 840, available soon (August 14th?). Benchmark
450W is enough for your system. My favorite is Seasonic G-450 SSR-450RM 80 PLUS Gold.
Don't forget a better CPU cooler if you care about quietness. SilverStone NT01-PRO is designed for this case. Add 2 x 80mm PWM fan (e.g. ARCTIC F8 PWM, GELID Silent 8 PWM, Noctua NF-R8 PWM).
I built a system for a friend of mine using i5-4670 and GD06. He constantly complained about noise. I replaced the PSU fan (SilverStone Strider Plus 500W with a ADDA 2000rpm fan) with a 800rpm fan, then undervolted the three case fans with Zalman Fan Mate 2 and Phobya PH-81038 Y-Cable 3Pin Molex to 4x 3Pin Molex (now running @800rpm), then replaced the cooler with the above one. He is now very satisfied even at encoding.